Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.193..105g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 193, no. 1, July 1992, p. 105-107.
Astronomy and Astrophysics
Astrophysics
3
Emission Spectra, Line Spectra, Periodic Variations, Planetary Nebulae, Electrodynamics, Electron Energy, Forbidden Transitions, Magnitude, Oxygen Ions
Scientific paper
The variation in the ratio of the intensity of the emission line 4363
forbidden O to the intensity of the H-gamma emission line in the
spectrum of the starlike PN IC 4997 during 1938-1990 is discussed. A
scenario of this star's evolutionary development based on this variation
is briefly given.
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